Health Watch: The New 4-Strain Flu Vaccine

Two syringes containing flu vaccine lie ready at the Whitman-Walker Health Clinic in Washington, DC on January 10, 2013. The Center for Disease Control and Prevention has said that this year's flu season is expected to be one of the worst the country has seen in 10 years. AFP PHOTO Eva HAMBACH (Photo credit should read EVA HAMBACH/AFP/Getty Images)